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k in (-oo:+oo)
(9/5)*k-459.67 = 90 // - 90
(9/5)*k-459.67-90 = 0
9/5*k-549.67 = 0 // + 549.67
9/5*k = 549.67 // : 9/5
k = 549.67/9/5
k = 305.37222222
k = 305.37222222
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